Methods
No-dig methods allow nature to carry out cultivation operations. Organic matter such as well rotted manure, compost, leaf mold, spent mushroom compost, old straw, etc., is added directly to the soil surface as a mulch at least 5-15 centimeters (2–6 in) deep, which is then incorporated by the actions of worms, insects and microbes. Worms and other soil life also assist in building up the soil's structure, their tunnels providing aeration and drainage, and their excretions bind together soil crumbs. This natural biosphere maintains healthy conditions in the upper soil horizons where annual plant roots thrive. No-dig systems are said to be freer of pests and disease, possibly due to a more balanced soil population being allowed to build up in this undisturbed environment, and by encouraging the buildup of beneficial rather than harmful soil fungi. Moisture is also retained more efficiently under mulch than on the surface of bare earth, allowing slower percolation and less leaching of nutrients.
Another no-dig method is sheet mulching wherein a garden area is covered with wetted paper or cardboard, compost and topped off with landscape mulch.
A no-dig system is easier than digging. It is a long term process, and is reliant upon having plentiful organic matter to provide mulch material. It is also helpful to remove any perennial weed roots from the area beforehand, although their hold can be weakened by applying a light-excluding surface layer such as large sheets of cardboard or several thicknesses of spread out newspaper before adding the compost mulch. The newspaper or cardboard should be thoroughly wet as well. A popular book, Lasagna Gardening by Patricia Lanza (Rodale Press, Inc.) provides excellent instructions for the novice user.
Esther Dean, an Australian gardener and author, pioneered no dig gardening. Dean wrote the books No-Dig Gardening and Leaves of Life. She was still actively gardening at age 86 and promoted gardens for those with special needs. She inspired many famous gardeners including Bill Mollison of the Permaculture Movement although she said "it is not quite how I would do it", implying she did not allow nature to take over, but retained formality with strict garden edges and more annuals.
Gardens fashioned on Esther Dean's no dig gardening principles include Randwick Community Organic Garden (RCOG), Sydney, New South Wales, Australia.
Read more about this topic: No-dig Gardening
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